. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 426 ANGIOSPERMAE—DICOTYLEDONES pp. 175, 344-)—This species is native to the high Alps. Hermann IMiiller describes the flowers as protogynous, but with persistent stigmas, so that automatic self- polhnation takes place normally and tolerably soon. Ricca says the flowers are protogynous with short-lived stigmas. Kerner adds that anthesis lasts four days, that the outer stamens serve for cross- and the inner ones for self-pollination, and that the scale-like ne
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 426 ANGIOSPERMAE—DICOTYLEDONES pp. 175, 344-)—This species is native to the high Alps. Hermann IMiiller describes the flowers as protogynous, but with persistent stigmas, so that automatic self- polhnation takes place normally and tolerably soon. Ricca says the flowers are protogynous with short-lived stigmas. Kerner adds that anthesis lasts four days, that the outer stamens serve for cross- and the inner ones for self-pollination, and that the scale-like nectaries are cleft at the tip. (Cf. Fig. 142.) Visitors.—Herm. Miiller only observed a Chrysidid and a Pyralid. 1003. S. Telephium L. (Herm. Miiller, 'Fertilisation,' pp. 253-4.)—The two species (S. maximum Siiler and S. purpureum Link) into which S. Telephium is now divided possess the same flower mechanism, except that the inner stamens of S. purpureum are inserted into the petals one-sixth of the way up. Hermann Miiller states that the anthers of the five outer stamens dehisce first, and then those of the five inner ones; and it is only when the latter have withered that the stigmatic papillae develop. The stamens lie close to the widel\- radiating petals, so that self-pollination is excluded even if some pollen remains clinging to the anthers until the stigmas are Fig. 143. Sediiin Tekp/tt'uvj, L. (after Herm. Miiller . (I aftt^r removal oftht: carpels, to show the li\c nectarirs. Flo\M r ^reii liotii ,il)o\n. U'l riie ^.ame The nectaries are situated as in S. acre, but their form is somewhat different: in S. Telephium, they are on the tips of longish scales at the bases of the petals and below the ovaries. Nectar-sucking or pollen-collecting insects that creep about on the crowded inflorescences touch the anthers and stigmas of numerous flowers in succession, and since these are protandrous effect crossing: they may also, however, occasionally eff^ect self
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